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Author/Creator
- Fullerton, David S.4
- Geological Survey (U.S.)4
- Richmond, Gerald Martin, 1914-4
- Christiansen, Ann Coe2
- Gray, Henry Hamilton, 1922-1
- Hallberg, George R.1
- Hartshorn, Joseph H. (Joseph Harold), 1922-1
- Howard, Alan D.1
- Indiana. Geological Survey1
- Iowa Geological Survey1
- University of Massachusetts at Amherst. Department of Geology and Geography1
- University of Virginia. Department of Environmental Sciences1